The part nobody teaches: what to do after you pass

The exam gets you a license number. Nobody hands you the 90-day clock, the bond, the contract with the notices CSLB actually cites, or what to say when the customer says the other guy is cheaper. These 102 lessons, worked cases, and fill-in templates do. Every one is dated to the California law it describes.

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Part 0 · 6 items

From Pass Letter to License Number

What CSLB requires after you pass, the 90-day clock, the bonds, workers' compensation, and the mistakes that hold a license up.

0.1Lesson 9 min
What happens after you pass: the 90-day clock and the six things CSLB needs
Passing the C-36 exam does not make you a contractor. CSLB sends a bond verification and license fee notice, and you have 90 days from that notice to return the initial license fee, a $25,000 contractor's bond, a bond of qualifying individual if one applies, workers' compensation proof or a defensible exemption, and the asbestos open-book exam form. Miss the 90 days and the application is void. This lesson runs the sequence in the order CSLB processes it, with the mistakes that hold licenses up.
Current as of September 2026Read the summary
0.2Lesson 8 min
The $25,000 bond: what it protects, what it does not, and how it quietly disappears
Every California contractor license needs a $25,000 contractor's bond on file, and many need a second $25,000 bond for the person who qualifies the license. The bond is not insurance for you. It pays the homeowner, the employee, or the state when you break license law, and then the surety comes to you for the money. It is one pool for every job you do, not $25,000 per job, and it can be drained. This lesson covers who can claim against it, what happens the day your surety cancels, the extra $100,000 bond and $1,000,000 insurance policy an LLC must carry, and the cashier's-check alternative that ties up your money for three years.
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0.3Lesson 9 min
Workers' compensation: what a C-36 must carry today, and what changes in 2027 and 2028
A C-36 with no employees can still file a workers' compensation exemption today, but that exemption is on a clock and about to be audited. Senate Bill 216 made coverage mandatory for every classification; Senate Bill 1455 set that date at January 1, 2028, and requires CSLB to verify exemption claims by January 1, 2027. If your license is qualified by an RME, or you hire anyone for any length of time, the exemption is not available at all. This lesson lays out exactly who must carry coverage now, the 90-day rule when you hire, what a lapse does to your license, and why most new contractors should skip the exemption.
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0.4Lesson 10 min
Who qualifies the license: sole owner, RMO, RME, and why lending your license ends careers
Every contractor license has a qualifying individual: the person whose four years of experience got the license issued, and who is legally responsible for supervising the company's construction work. For a sole owner that is you. For a corporation or LLC it is a responsible managing officer (RMO) or a responsible managing employee (RME), and the rules for each are different. This lesson explains the three paths, what "direct supervision and control" legally requires, why a qualifier can serve only one company at a time, and why the offer you will eventually get to "just put your license on my company" is a misdemeanor for you and the end of the license.
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0.5Lesson 8 min
Your business name: what CSLB allows, the fictitious business name filing, and the 90-day rule for changes
The name on your license is the only name you may contract, advertise, or bond under. CSLB rejects names that suggest classifications you do not hold and names that do not match the type of entity licensed, and allows only one name per license. If you trade as anything other than your own legal name, California also requires a fictitious business name statement with your county within 40 days, published for four weeks, refiled every five years. And every change of business name, address, or personnel must reach CSLB within 90 days or the license is out of compliance. This lesson walks through the name rules, the county filing, and the change-reporting duty, so the name on your truck matches the name on your bond.
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0.6Case 9 min
Case: three applicants, three delays. What held each one up
Three new C-36 licensees do everything the pass letter told them to do, and each one loses weeks, and in one case a job, to a rule that was never on the checklist. One buys a bond in the wrong name. One forms an LLC with a partner and files a workers' compensation exemption the company is not allowed to claim. One takes a friend's offer to be his RMO and finds out what "one license at a time" means. This case lesson walks each delay back to the rule that caused it, and gives the order of operations that would have avoided all three.
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Part 1 · 10 items

Setting Up the Business

Entity choice, the money setup, city licenses, the insurance stack, the sales tax rule most plumbers get wrong, and the taxes that come due every quarter.

1.1Lesson 8 min
The entity is a one-way door: why you decide sole owner, LLC, or corporation before the license issues
A contractor license is issued to one specific legal person: you as an individual, or a corporation, or an LLC. It is never transferable. If you license as a sole owner and later form a company, the company needs its own application, its own bond in its own name, and, unless you keep more than half of it, its own license number, which means starting your license history over. This lesson explains what the law actually allows when you change entity, what the LLC and corporation add to the checklist, and why the entity decision belongs before the application, not after the first good year.
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1.2Lesson 12 min
Sole owner vs. LLC vs. S corporation for a plumbing contractor: liability, tax, cost, and the small claims limit
The internet's answer is "form an LLC." For a one-person plumbing business in California that answer is often wrong, because the state charges an LLC $800 a year plus a fee on gross receipts, CSLB adds a $100,000 bond and a $1,000,000 insurance policy, and the liability protection is thinner for a contractor than for almost any other business. This lesson lays the three structures side by side on the four things that matter: what each protects you from, what each costs the state and CSLB, how each is taxed, and a detail almost nobody mentions, that a sole owner can sue a non-paying customer in small claims for twice as much as a company can.
Current as of September 2026Read the summary
1.3Lesson 10 min
EIN, the business bank account, and separating the money: the first bookkeeping setup that survives an audit and a lawsuit
Before the first invoice goes out, the business needs its own tax number, its own bank account, and a way of recording every dollar in and out that you will still understand in April and in a deposition. The EIN is free and takes minutes. The bank account is where the liability protection of a company is actually won or lost, and where a sole owner keeps an audit from turning into a nightmare. The bookkeeping setup is five categories, one rule about receipts, and a Friday habit. This lesson gives the exact order and the records the IRS, the state, and a lawyer will each ask you for.
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1.4Lesson 9 min
City business licenses: every city you work in, the Los Angeles business tax, and the seven-day rule
California has no statewide business license, so the license lives at the city level, and a contractor needs one in every city where the work happens, not just where the shop is. The biggest example is Los Angeles, which taxes contractors on gross receipts, counts you as doing business in the City after seven days of physical work in a year, and exempts small businesses under $100,000 only if the renewal is filed on time. This lesson covers how city licenses work statewide, the Los Angeles rules in detail because most C-36s will touch the City eventually, and the calendar that keeps the licenses from becoming penalties.
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1.5Lesson 12 min
The insurance stack: general liability, commercial auto, the bond, and workers' comp. What each covers, what each does not, and who will demand it
A new contractor deals with four products that all get called "insurance" and do four different jobs. The bond pays the customer when you break license law, then bills you. General liability pays for damage your work causes to other people's property and bodies, but not for redoing the work itself. Commercial auto covers the van that your personal policy quietly stopped covering the day you lettered it. Workers' compensation covers the person you hire, and is on the way to being mandatory for everyone. This lesson explains each one plainly, the exclusions that surprise plumbers most, the sentence about insurance that state law makes you put in every home improvement contract, and who will demand a certificate before you can start.
Current as of September 2026Read the summary
1.6Lesson 12 min
Sales tax for contractors: materials vs. fixtures. The CDTFA rule most plumbers get wrong
California treats a plumber as two different taxpayers depending on what is being installed. For materials, pipe, fittings, valves, solder, you are the consumer: you pay sales tax to the supply house and you do not charge the customer tax. For fixtures, water heaters, toilets, faucets, disposals, water softeners, you are the retailer: the state wants tax on what you sell the fixture for, and if your contract is a lump sum, on what the fixture cost you. Get this backwards in either direction and you are either overcharging customers with a tax you have no permit to collect, or under-reporting to the CDTFA and building an audit liability. This lesson gives the rule, the two lists, the seller's permit question, and how to write invoices so the numbers come out right.
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1.7Lesson 12 min
Quarterly estimates, self-employment tax, deductions, and mileage: the tax calendar for a first-year contractor
Nobody withholds tax from a plumbing invoice. The first year in business is the year you discover that the $14,000 you owe in April was supposed to have been paid in four pieces during the year, that self-employment tax is a second tax on top of income tax, and that California collects its estimates on a different schedule than the IRS. This lesson lays out the two calendars, the safe-harbor rules that stop penalties even when you guess wrong, the deductions a plumber actually has, and the two ways to deduct the van, with the record each one requires.
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1.8Lesson 10 min
Hiring readiness: what has to exist before the first helper's first day
The first helper is where most solo plumbing businesses either become companies or become defendants. California law does not let you call a helper without a contractor's license an independent contractor: under Labor Code 2750.5, anyone doing licensed work without a license is presumed your employee, and the license is a condition of contractor status. So the day-rate guy is an employee, with everything that implies. This lesson is the list of what must exist before that person's first day: workers' compensation, the EDD account, the paperwork on day one, the pay stub, and the minimum wage. The full hiring and payroll process, with the templates, is in the Growing phase; this is the readiness check so you do not hire before the business can.
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1.9Template 6 min
Template: the business setup checklist, from pass letter to first invoice
One page, in order, with the rule behind each line. Print it the day the pass letter arrives and work down it. Every item points to the lesson that explains it, and the filled-in example at the bottom shows what the sheet looks like for a sole-owner C-36 in Los Angeles County on the day the first invoice goes out.
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1.10Template 6 min
Template: the insurance requirements matrix. Who demands what, and the certificate that satisfies each one
A one-page matrix of every party that will ask you for proof of insurance, what each one is legally entitled to demand versus what each one usually demands anyway, and the exact certificate or endorsement that satisfies them. Fill in your own policy numbers once and the sheet becomes the answer to every "send me your COI" email. The worked example shows the sheet for a sole-owner C-36 with the stack from lesson 1.5.
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Part 2 · 13 items

Getting Work

Where the first jobs come from, the relationships that feed a plumbing business, the advertising rules that can suspend a license, pricing, and estimating as a method rather than a guess.

2.1Lesson 9 min
Where the first ten jobs actually come from
The first ten jobs do not come from advertising. They come from the people who already know you can do the work, from the plumbers who have too much of it, and from the two or three counters where you have bought parts for four years. This lesson lays out the six sources that produce the first ten jobs for almost every new C-36, in the order they produce, and the one thing each source needs from you before it will send work. It also names the two mistakes that turn a good first job into a bad first month.
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2.2Lesson 9 min
Supply-house relationships and credit: the account, the terms, the personal guarantee, and the notice your supplier sends your customer
A supply-house account is the first credit a new contractor gets and the one that decides whether the next ten jobs can be materials-in-hand. This lesson explains how the account works, what the application's personal guarantee means for the entity you just chose, why paying on day 28 instead of day 45 is worth more than any discount, and the piece of paper that surprises new contractors most: the preliminary notice your supplier is legally allowed to send to your customer, and what to tell the customer before it arrives.
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2.3Lesson 11 min
Subbing to general contractors: how to get on the list, what they check, and the four clauses in the subcontract that matter
Subcontracting to general contractors is the steadiest early work a C-36 can get and the easiest to lose money on. The GC will check your license, your insurance, and your references before you get on the list, and then hand you a subcontract written by their lawyer. This lesson explains what the GC is actually checking, how to get onto the bid list, and the four clauses in every subcontract to read before signing: payment timing, which California law already regulates in your favor; retention; indemnity, which the law limits on residential work; and scope, which the law does not protect you from at all.
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2.4Lesson 10 min
Property managers, home-warranty companies, and realtors: volume vs. margin, and the paperwork each one lives on
Three sources send a plumber steady work at a price the plumber does not set. A property manager sends the same building's calls for years, at a negotiated rate, and needs them handled before a tenant's habitability complaint becomes a legal problem for the landlord. A home-warranty company sends dispatches at a flat trip fee with the repair pre-authorized to a cap, and pays on its own terms. A realtor sends inspection-repair jobs on a two-week escrow clock. This lesson explains what each relationship is actually buying, what it pays and does not pay, the paperwork each one requires, and how to decide how much of each a new business should take.
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2.5Lesson 11 min
Google Business Profile, reviews, and referrals: the only marketing that matters in year one, and the two laws that govern reviews
In year one, the marketing that produces customers is a complete Google Business Profile with real photos, a steady stream of honest reviews from the first hundred customers, and a referral habit that sends work back to the people who sent it. Paid ads, lead-selling platforms, and social media come later, if ever. This lesson is the profile setup that gets a plumber shown, the review system that runs itself, the referral loop, and the two laws that make it dangerous to get creative with reviews: California's ban on penalizing customers for what they say, and the federal rule that makes a bought or fake review a per-violation penalty.
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2.6Lesson 9 min
Advertising law for a licensed contractor: the number on every ad and the van, the word you can never use, and what a misleading ad costs
CSLB regulates what a contractor says in public more tightly than most new licensees expect, and it enforces the rules with citations and, in one case, suspension. The license number must appear on every form of advertising, and the regulation defines advertising to include business cards, the van, the website, a directory listing, and a text message with a bid in it. A C-36 has its own vehicle rule with a letter-height requirement. Advertising the bond is grounds for suspension. A misleading ad, or an advertised price you do not honor, is a misdemeanor. This lesson lists every rule with its section and shows what a compliant van, card, and ad look like.
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2.7Lesson 12 min
Pricing models: hourly vs. a flat-rate price book, the service fee, and good/better/best, inside the rules for service calls
How you price is a business decision. What the price has to look like on paper is law, and for the most common plumbing job, the service call, the law is specific: one service charge, a stated contract price, no payment until the work is done, no work beyond the problem the customer called about. This lesson lays out the three pricing models a plumber can run, hourly, flat-rate price book, and good/better/best options, with the real tradeoffs of each, and then maps each model onto the two contract forms California allows, so the way you price never puts you on the wrong form.
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2.8Lesson 14 min
Estimating as a method: takeoff, labor units, materials, overhead recovery, markup vs. margin, and contingency
Every losing job was estimated by feel. This lesson replaces feel with a six-step method that produces the same price whether you are tired, rushed, or talking to a customer who says the other guy was cheaper: count the work, convert it to labor hours with units, price the materials at what they actually cost you, recover the overhead the job has to carry, apply the margin you need rather than a markup you heard, and add a contingency that matches the risk. It ends with a full worked example, a 50-gallon gas water heater replacement, priced from scratch, and the one arithmetic mistake that quietly cuts profit in half.
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2.9Lesson 9 min
Estimate vs. quote vs. bid: the legal difference, and the moment a number becomes a contract
Contractors use "estimate," "quote," and "bid" as if they were the same word with different levels of confidence. In law they are different things, and the difference is whether the number can be held against you. An estimate is an approximation and says so; a quote is an offer to do defined work for a fixed price; a bid is a quote submitted in competition, and in California a subcontractor's bid to a general contractor becomes binding the moment the GC relies on it. This lesson gives the legal definition of each, the words that make a number one or the other, how long an offer stays open, and how the home improvement contract law folds the estimate into the contract itself.
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2.10Lesson 11 min
Public works: DIR registration, prevailing wage, certified payroll, and apprentices. A separate world; know it before you bid
A school district's plumbing repair, a city's park restroom, a county building's water heater: public work looks like private work and is governed by an entirely different body of law. Above $1,000 you must pay the prevailing wage the state sets for the plumber's craft in that county, which is usually far above the private market. Above $25,000 you must be registered with the Department of Industrial Relations before you bid, submit certified payroll records for every worker every week, and, above $30,000, employ apprentices at a fixed ratio. This lesson lays out the thresholds, the registration, the paperwork, and the arithmetic, so the decision to bid public work is made with the rules in front of you rather than discovered in the first payroll audit.
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2.11Template 6 min
Template: the estimate worksheet, blank and worked
One sheet, used on every job that is not already in the price book, that walks the takeoff, labor units, loaded rate, materials, overhead, contingency, and margin in order and produces a price by division rather than by feel. The blank is followed by the same sheet filled in for a 50-gallon gas water heater replacement, so the format is never in doubt. Keep the finished sheet in the job folder; it is what a change order is measured against.
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2.12Template 8 min
Template: the price-book starter. Forty service tasks, each with the line that builds its price
A price book is forty tasks and one formula. This template gives the forty tasks a residential service plumber quotes most, grouped so the book can be carried on two pages, with a line under each task for the labor units, materials, and computed price, and marks which tasks can go on the service and repair contract and which are always a home improvement contract. Two tasks are worked through so the format is clear. Fill the units from your own jobs, compute the prices once from your own rates, and rebuild the book whenever the rates at the top change.
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2.13Template 6 min
Template: the first-90-days marketing plan. Thirteen weeks, one page, nothing paid
A week-by-week plan for the first quarter that spends time instead of money, with a compliance check built into every item so the van, the card, the profile, and the first review request are lawful before they are public. Week one is the profile and the van; weeks two through four are the first-ten-jobs calls; weeks five through thirteen are the review and referral loop with a weekly number to hit. The worked example at the bottom shows the sheet filled in for a sole-owner C-36 with a full calendar by week nine.
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Part 3 · 19 items

Contracts and Getting Paid

The home improvement contract with every required notice, the deposit cap that CSLB cites most, change orders, the 20-day notice, mechanics liens, collections, and three cases where a contractor lost money on paper before losing it on the job.

3.1Lesson 14 min
The home improvement contract (B&P 7159): every required element, the exact notices, and the three-day right to cancel
Every residential plumbing job over $500 is a home improvement contract under Business and Professions Code section 7159, and the section does not merely require a contract; it dictates what the contract says, in what typeface, under which headings, with which statutory notices attached, and what the customer must be handed before the first tool comes off the truck. Missing any of it is cause for discipline, and the deposit and progress-payment rules inside it are misdemeanors. This lesson walks the section top to bottom, explains what each piece is for, and shows why the three-day right to cancel decides when you may start work. The template that follows it is the form itself, with every notice verbatim.
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3.2Lesson 10 min
The deposit cap: $1,000 or 10 percent, whichever is less, and progress payments that cannot exceed the work. CSLB's most common citation
On a residential job, the most money you may take before doing any work is $1,000 or 10 percent of the contract price, whichever is less, and after that you may never hold more of the customer's money than the value of the work done and the materials delivered. Both rules are printed in 12-point boldface on the contract the state makes you use, both are misdemeanors, and the first is the violation CSLB cites most often because it is the easiest to prove: the check is the evidence. This lesson explains the two rules, the schedule of progress payments that makes a large job cash-flow lawfully, the lien release you owe with each payment, the bonded-contractor exemption, and the special rule for service calls, where no deposit at all is allowed.
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3.3Lesson 11 min
Service and repair contracts (B&P 7159.10): when the short form applies, what it must say, and how a service call falls out of it
The service and repair contract is the form for the ordinary plumbing call: the customer phoned, the job is $750 or less, you fix what they called about, and they pay when it is done. In exchange for those four conditions the law drops the three-day cooling-off period and most of the home improvement notices, and gives you a one-page contract you can fill in at the kitchen table. But the four conditions are strict, the form still has a dozen required elements including a right-to-cancel notice of its own, the service charge must be disclosed in every ad and on the phone, and the moment any condition fails, the full home improvement contract was required and the customer can rescind. This lesson is the form and the trap.
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3.4Lesson 12 min
Subcontracts with GCs: the twelve clauses to read, what to strike, and what to negotiate
Lesson 2.3 covered how to get onto a general contractor's list and the four pressure points in every subcontract. This lesson is the full review: the twelve clauses a plumber reads before signing, in the order they appear in most GC forms, with the California rule that governs each one, what the law already gives you so you can leave the clause alone, what you should strike because the law makes it void anyway, and what you should negotiate because nothing protects you but the negotiation. It ends with the subcontract review checklist the template set carries, so the review takes twenty minutes and happens every time.
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3.5Lesson 10 min
Change orders: written, signed, before the work. Every time. Why verbal ones end in CSLB complaints
The change order is where a residential plumbing job most often turns into a CSLB complaint, because the extra work was real, the customer agreed to it at the time, and nothing was written down. Under Business and Professions Code section 7159, a change is not part of the contract, and is not enforceable against the customer, unless it is in writing, signed by both, before the work, and states the scope, the price change, and the effect on the payment schedule. The contract itself must tell the customer that, in a notice they signed. This lesson explains the rule, the sentence about "unjust enrichment" that contractors mistake for a safety net, the three-minute change-order habit that makes the rule painless, and the template that goes in every truck.
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3.6Lesson 11 min
Mechanics liens I: the 20-day preliminary notice. Miss it, lose your rights
A mechanics lien is the strongest collection right a contractor has, a claim recorded against the property itself, and for anyone who did not contract directly with the owner it depends on one piece of paper sent in the first twenty days of the job: the preliminary notice. No notice, no lien, no stop payment notice, no bond claim. This lesson explains who must send it, to whom, by when, what it must say, how it must be delivered, and the one habit that makes it automatic. It also explains why the direct contractor on a residential job usually does not need to send it, and the one case where they do.
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3.7Lesson 14 min
Mechanics liens II: recording deadlines, the 90-day foreclosure clock, the four statutory release forms, stop payment notices, and payment bonds on public work
The preliminary notice keeps the lien right alive. This lesson is the right itself: the window in which a lien must be recorded after the job ends, which is shorter than most contractors think and shorter still if the owner records a notice of completion; the claim of lien's required contents and the Notice of Mechanics Lien that must be served on the owner or the lien is void; the 90-day deadline to file the foreclosure suit; and the four statutory waiver and release forms that are the only lawful way to give up lien rights, with the difference between conditional and unconditional that has cost contractors whole invoices. It closes with the two tools that replace the lien where the lien cannot reach: the stop payment notice on private jobs with a lender, and the payment bond on public work.
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3.8Lesson 12 min
Collections: demand letter, lien, small claims, attorney. When each is worth it, and the one thing that makes all of them impossible
An unpaid invoice has four escalations, each with a cost and a deadline: a written demand, a mechanics lien, a small claims case, and a lawyer. The right one depends on the amount, the entity you chose in Phase 1, whether the lien window is still open, and whether the customer is a homeowner or a general contractor. This lesson gives the decision for each stage, the letter that resolves most disputes before the lien, the small claims process a sole owner can run alone for up to $12,500, and the rule that overrides all of it: a contractor who was not properly licensed at every moment of the job cannot collect at all, and the customer can sue to get back what they already paid.
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3.9Lesson 10 min
Taking payment: cards, ACH, checks, cash, financing partners, and getting every dollar into the right account
How a customer pays decides when the money arrives, what it costs to accept, and whether the state's honest-pricing law, the contract law, and the IRS have anything to say about it. This lesson sets up the payment methods a plumbing business should accept and the order to offer them, explains why a card surcharge added at the invoice is a legal problem in California while a cash discount is not, how a financing partner has to appear on the contract, what a $10,000 cash payment triggers with the IRS, and the one habit from Phase 1 that all of it depends on: every dollar, by every method, into the business account, the same day, tied to an invoice number.
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3.10Case 10 min
Case: the job that went unpaid. Where the contractor lost lien rights and how to have kept them
A plumbing subcontractor does $38,000 of clean work on a restaurant buildout, is paid $21,000, and never sees the rest. The general contractor ran out of money, the owner had paid the GC in full, and there was a construction lender. Six decisions, each of them ordinary, took away every remedy the law had given this plumber: the preliminary notice never sent, the unconditional release signed for a check that never came, the notice of completion nobody watched for, the lien recorded late and served on nobody, and the entity that capped the small claims case at $6,250. This case walks each decision to the rule it broke and shows the version of the job where the plumber is paid.
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3.11Case 8 min
Case: the deposit that became a citation
A plumber replaces a water heater and a pressure regulator for a retired customer, does excellent work, takes a $900 deposit on a $2,900 job because "that's what everyone does," and starts the same afternoon. The customer's daughter, who manages her mother's money, reads the contract that night, sees the 12-point boldface line that says the deposit may not exceed $1,000 or 10 percent, does the arithmetic, and files a complaint. The work was never the issue. This case walks the three violations that were on the paper before the first fitting was cut, what the investigator asked for, what the citation cost, and the version of the same afternoon that produced a happy customer and a clean license record.
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3.12Case 9 min
Case: the change order that was never written
A whole-house repipe at $16,400 grows by $2,350 over nine working days: a relocated washer box, a second hose bibb, a rerouted line around a beam nobody knew was there, and an upgraded shutoff the customer asked for while standing in the garage. Every addition was requested, every addition was agreed to, and every addition was verbal. At the final, the customer pays the contract price and disputes the rest, holding a signed notice that says an unwritten change order is not enforceable against her. This case follows the four changes to the final invoice, the small claims hearing, the CSLB complaint that came out of it, and the nine days as they would have gone with a change-order pad in the truck.
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3.13Template 12 min
Template: the home improvement contract, with every B&P 7159 notice verbatim
The complete home improvement contract in the order section 7159 requires, with each statutory statement and notice reproduced word for word, the type sizes the statute demands marked in brackets, and blanks for your job. Print it, have an attorney look at it once, and then use it for every residential job over $500 that does not qualify for the service and repair form. A filled-in example for the $2,575 water heater follows the blank so the deposit, the dates, and the notices are shown as they should read.
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3.14Template 8 min
Template: the service and repair contract (B&P 7159.10), one page, with the notices verbatim
The one-page form for the ordinary service call: the customer called, the job is $750 or less, you fix what they called about, and they pay when it is done. Every element section 7159.10 requires, in order, with the statutory notices word for word and the type sizes marked, plus a filled-in example for a $475 pressure regulator replacement. Carry it with the home improvement contract; the moment a call fails one of the four conditions, switch forms.
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3.15Template 5 min
Template: the change order, one page, signed before the work
The form for lesson 3.5's three-minute habit: scope, amount, effect on payments and completion, both signatures, before the work, with the statutory change-order statement and the subcontractor disclaimer printed on it. A pad of these in the truck is the difference between the case in lesson 3.12 and getting paid. Two filled-in examples follow, one addition and one deduction.
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3.16Template 6 min
Template: the 20-day preliminary notice, with the proof-of-notice declaration
The form to send on day one of every job where you did not contract with the owner: the statutory contents, the boldface notice to the owner word for word, and the proof-of-notice declaration to fill out the same day with the mailing receipts attached. A filled-in example for a subcontract on a restaurant buildout follows the blank.
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3.17Template 8 min
Template: the four statutory lien waiver and release forms (Civil Code 8132 to 8138), verbatim
The only four forms California allows for waiving lien, stop payment notice, and payment bond rights, exactly as the Civil Code sets them out, with the rule for which one to use when: conditional with the invoice, unconditional when the check has cleared; progress during the job, final at the end. Never sign an unconditional release before the money is in your account; the form itself warns you in the largest type on the page.
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3.18Template 5 min
Template: the demand letter, homeowner version and general contractor version
Two one-page demand letters, one to a homeowner and one to a general contractor, that state the facts, the amount, the deadline, and the exact next step the law provides, in a tone the Rosenthal Act allows and a court will read as fair. Send by certified mail and email at day 10 past due. Most unpaid invoices end here.
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3.19Template 6 min
Template: the subcontract review checklist. Twelve clauses, three boxes each
One page to fill out before signing any subcontract, in the order the clauses usually appear, with three boxes per clause: the law overrides it (sign), strike it (with the section to cite), or negotiate it (with your ask written in). A filled-in example for a residential remodel subcontract follows. Keep the completed sheet in the job folder with the marked-up subcontract.
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Part 4 · 27 items

The Field: Method, Code, and Cases

One diagnostic method applied to every call a new C-36 gets: permits, the daily-use code, gas, water heaters, sewer and drain, leaks, pressure, sewer gas, treatment, fixtures, materials, commercial basics, Cal/OSHA, lead and asbestos, and the cases where the method decided the outcome.

4.1Lesson 12 min
The diagnostic method: verify, isolate, cheapest test first, cause not symptom, the options ladder, document
A plumber who has passed the exam knows the code. A plumber who runs a business needs one method that turns any call into a finding, a set of priced options, and a paper trail, the same way every time, whether the call is a hissing wall or a heater that failed inspection. This lesson is that method in six steps: verify what the customer actually observed, isolate which system it belongs to, run the cheapest test that can rule something out, keep going until you have the cause rather than the symptom, present an options ladder with a cost band, a permit path, and a code section for each rung, and document it so the next person, or the investigator, can follow it. Every domain lesson in this phase applies it; the cases show it deciding outcomes.
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4.2Lesson 12 min
Permits: when one is required, what is exempt, pulling it online, the inspection sequence, what inspectors look for, and handling corrections
The permit is where the field meets the license record. Section 104.1 of the California Plumbing Code makes it unlawful to install, alter, repair, replace, or remodel a plumbing system without a permit, and section 104.2 exempts exactly two things: stopping leaks without replacing pipe, and clearing stoppages or repairing leaks without replacing or rearranging anything. A water heater replacement, a repipe, a sewer lateral, a new gas line, a moved fixture: all permits. This lesson lays out the line between exempt and permitted work, how the big cities issue residential plumbing permits online, the rough-to-final inspection sequence, what inspectors check on the jobs a C-36 does most, and how to handle a correction notice without losing the customer or the day.
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4.3Lesson 13 min
Daily-use code: drainage slope, venting, water sizing, cleanouts, trap arms, and fixture units, with the section for each
The exam taught the code chapter by chapter. The field uses about a dozen numbers from it every day, and an inspector checks the same dozen on every rough. This lesson is those numbers, in the order a plumber meets them on a job, each with the 2025 California Plumbing Code section that governs it: how much a drain has to fall, where cleanouts go, how long a trap arm can be, how big a drain and a vent must be for the fixtures on them, where the vent can come out of the roof, and how to size supply piping by fixture units. It is written to be read once and then kept on the phone.
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4.4Lesson 13 min
Gas piping in practice: sizing, CSST bonding, the pressure test, appliance connectors and shutoffs, sediment traps, and seismic shutoff valves
Gas is the system where a plumber's mistake is not a callback. This lesson is the working rules a C-36 uses on every gas job: how to size a line by the longest-length method against the code tables, why every CSST installation must be bonded to the electrical grounding electrode system, the California pressure test (10 psi for at least 15 minutes, no perceptible drop), what an appliance connection must consist of and where the shutoff has to be, the sediment trap the inspector always looks for, and the seismic gas shutoff valve that Los Angeles requires on sale and on alterations over $10,000, which is a permit item a plumber can sell honestly and install correctly.
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4.5Lesson 13 min
Water heaters I: tank. Seismic strapping, the T&P discharge line, expansion tanks, sediment traps, pans, venting, and the garage rules
The tank water heater is the job a residential plumber does most and the job that fails inspection most, for the same six reasons every time. This lesson is those six items with the code section and the exact requirement for each: the two seismic straps and where they go, the T&P discharge line and its eight rules, the expansion tank that a regulator or check valve makes mandatory, the sediment trap, the drain pan and when it is required, and the garage rules for ignition height and vehicle protection. It closes with the replacement sequence as an inspector would check it and with the case in lesson 4.20, where a heater failed twice on items that were on this page.
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4.6Lesson 13 min
Water heaters II: tankless and heat pump. Gas sizing, venting, condensate, the 2025 Energy Code direction, and where the gas-ban ordinances stand
The two water heaters that are not a tank each turn a four-hour swap into a design job. A gas tankless unit draws four to six times the input of the tank it replaces, so the gas line, the venting, and the condensate drain are the job, not the heater. A heat pump water heater draws almost no gas and instead needs a 240-volt circuit, air, a place for the condensate, and a customer who understands recovery time. Both are where California's energy policy is pointed: the 2025 Energy Code makes heat pump water heating the prescriptive baseline for new homes and additions. And both are the subject of local politics: the Berkeley gas ban was struck down in federal court in 2023 and repealed, and the South Coast air district's proposed zero-NOx water heater rule was voted down in June 2025. This lesson gives the method for each unit and the current state of the rules so the sale is honest.
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4.7Lesson 12 min
Sewer and drain I: the camera, the locator, hydro-jetting vs. cabling, and when each is the right tool
A stoppage is the most common call a plumber gets and the one where the difference between a technician and a contractor shows: the technician clears it, the contractor finds out why and offers the customer the ladder. This lesson is the drain call as a method: the questions and the cheap tests before the machine comes off the truck, the choice between a cable and a jetter and what each one can and cannot do, when the camera goes in and how to read what it shows, how a locator turns a camera image into a spot on the driveway, and how to write up a drain call so that the $340 clearing leads honestly to the $9,000 lateral when that is what the pipe needs.
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4.8Lesson 13 min
Sewer and drain II: trenchless vs. open trench, whose lateral it is (it varies by city), backwater valves, and point-of-sale lateral ordinances
When the camera shows a lateral that has to be replaced, the plumber has three questions before a price: how (open trench, pipe bursting, or a cured-in-place liner), whose pipe it is (in some California cities the owner is responsible all the way to the main, including under the street; in others the city owns the lower lateral from the property line), and what the city requires at the connection (an encroachment permit, a backwater valve, a cleanout at the property line). This lesson answers each with the method, gives the backwater valve rule that protects a low fixture and the customer's insurance claim, and explains the East Bay's point-of-sale lateral program as the model for the ordinances a plumber has to know before quoting a sewer job near a sale.
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4.9Case 12 min
Case: the hissing line. The meter test, the supply leak that fed the roots, the lateral to the city tap, and the contract and permit trail
A homeowner hears a hiss in the wall at night and has had the kitchen line cabled four times in two years. Two earlier plumbers treated two separate problems. The third runs the method from lesson 4.1 and finds one: a pinhole in the copper service line under the slab has been feeding water into the soil around a clay lateral for years, the roots that water grew have opened every joint, and the "kitchen stoppage" was the lateral. The case follows the meter test that found the leak in four minutes, the camera that found the cause, the ladder the customer was shown, the lateral replacement to the city connection under an encroachment permit, and every piece of paper from the first service and repair form to the final unconditional release.
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4.10Lesson 12 min
Leak detection: slab leaks, acoustic and pressure methods, thermal imaging, and repipe vs. reroute
The leak call is the one where a plumber can destroy a house looking for a $200 repair, and the one where the method pays for itself fastest. This lesson is the sequence: the meter test that splits service line from house, the hot-side-versus-cold-side isolation that splits the house in two, the pressure test that finds the slow ones, the acoustic and thermal tools that put a mark on the slab, and the inspection hole that confirms before it destroys. It ends with the decision that follows a slab leak: repair the spot, reroute the line overhead, or repipe the house, each with its cost logic, its permit, and the honest statement of what the other two would have meant.
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4.11Lesson 10 min
Low pressure: the PRV, galvanized pipe, and the sequence that finds which one it is
"Low pressure" is the customer's word for three different problems: low static pressure from the street or a failed regulator, low flow from pipe that has closed up inside, and a fixture that is clogged at the aerator. Each has a different fix and a different price, and the gauge on the hose bibb tells them apart in the first five minutes. This lesson is the sequence: static, then flow, then isolate by fixture and by section, then the ladder, which runs from a $12 aerator to a whole-house repipe of galvanized pipe, with the pressure-reducing valve in the middle as both the most common cause and the most common cure.
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4.12Lesson 10 min
Sewer gas: trap seals, trap primers, vents, and the sequence that finds the smell
A sewer smell is a trap that has lost its seal, a vent that is open where it should not be or blocked where it should be open, a drain fitting that is not gastight, or a fixture that was piped without a trap at all. The customer cannot tell which and often blames the wrong room. This lesson is the sequence: rule out natural gas first, then find the dry trap (the floor drain, the guest shower, the washer standpipe), then the trap that siphons because its arm is too long, then the vent that terminates by a window or has a cracked stack in a wall, then the fitting or the wax ring that leaks gas without leaking water. Each finding has its code section and its rung on the ladder, and the trap primer is the one most plumbers skip.
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4.13Lesson 11 min
Water treatment: where softeners are restricted in California, filtration, pressure regulators, and thermal expansion
Hard water is most of California, so softeners and filters are a steady add-on for a residential plumber, and they are the one product category the state lets local sanitation agencies ban. Health and Safety Code 116786 allows a local agency to prohibit self-regenerating softeners that discharge brine to the sewer where it finds the salt is a water-quality problem, and the Santa Clarita Valley did exactly that. This lesson covers the restriction and how to check it, the difference between a softener, a conditioner, and a filter and what each does and does not do, the drain and backflow rules that every treatment installation must meet, and the two devices that belong on every high-pressure house whether or not the customer buys treatment: the regulator and the expansion tank.
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4.14Lesson 11 min
Fixtures and conservation: CALGreen flow rates, SB 407 retrofit-on-alteration and disclosure-on-sale, 1.28 gpf, and the ADA basics a plumber needs
California's fixture rules decide what a plumber may install and what a plumber must replace. The plumbing code sets the flow rates for anything new: 1.28 gallons per flush, 1.8 gallons per minute at the showerhead and the kitchen sink, 1.2 at the bathroom sink. And a separate law, SB 407 in the Civil Code, reaches back into every house built before 1994: any permitted alteration triggers replacement of every old toilet, showerhead, and faucet in the house as a condition of the final inspection, and every seller must disclose whether old fixtures remain. This lesson gives both sets of numbers with their sections, explains what the SB 407 trigger means for a plumber pulling a permit in an older house, and covers the accessibility basics that apply the moment the customer is a business.
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4.15Lesson 12 min
Materials and methods: PEX vs. copper vs. CPVC, ABS vs. PVC (it is regional), cast iron, and the transitions that fail
Every material a plumber runs is approved somewhere in the code's tables, and every one has a place where it fails: PEX at the water heater, copper at the galvanized nipple, ABS glued to PVC with the wrong cement, cast iron cut without a shielded coupling. This lesson is the working comparison a contractor needs to choose and to price: supply in PEX, copper, or CPVC; drainage in ABS, PVC, or cast iron; where the state code draws its lines (PEX not within 18 inches of the heater, dielectric transitions, listed transition fittings), where the regional convention decides (ABS in most of California's residential work, PVC in some jurisdictions and most commercial), and where a city's amendment overrides all of it.
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4.16Lesson 11 min
Commercial basics: grease interceptors, the backflow program, and the tester certification that opens a second line of work
A C-36 who wants steadier work than residential service adds two commercial products: grease interceptors, which every restaurant and commercial kitchen must have and maintain, and backflow prevention, which every public water system must enforce at commercial service connections and which is tested annually by certified testers. This lesson gives the interceptor rule and sizing logic from the plumbing code, the structure of California's cross-connection program under the State Water Board's 2024 policy handbook, what a backflow assembly tester certification is and why it turns a plumber into a recurring-revenue business, and the parts of commercial work that are not in the plumbing code at all: the contract, the confined space, and the health inspector.
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4.17Lesson 13 min
Cal/OSHA for a small shop: the IIPP every employer must have, heat illness prevention, trenching and the 5-foot permit, confined space, silica, and ladders
The day a plumbing business hires its first helper it becomes an employer, and Cal/OSHA's rules apply in full, with no small-business exemption. The first one is a written Injury and Illness Prevention Program, which every employer must have and almost no new contractor does. The rest are the rules for the work a plumber actually does: heat illness prevention outdoors and, since 2024, indoors; trenching, where a 5-foot trench needs a protective system and a Cal/OSHA permit before anyone climbs in; confined spaces, which include the interceptor vault and the manhole; silica from cutting concrete and tile; and ladders. This lesson gives each rule at the level a small shop must know it, with the section to read, and the case for treating the rules as the shop's, not the helper's.
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4.18Lesson 12 min
Environmental rules: EPA lead-safe certification for any pre-1978 home, asbestos and transite pipe, and stormwater
Three environmental rules reach into ordinary plumbing work and are enforced by agencies most plumbers never meet until the fine arrives. The federal lead rule makes any work for pay in a pre-1978 home that disturbs painted surfaces, which a repipe, a wall opening, or a tub replacement does, a job for an EPA-certified firm using a certified renovator and lead-safe practices, with a pamphlet to the customer before starting. Asbestos is in the transite pipe, the old duct wrap, and the floor tile a plumber cuts through; California's license law exempts transite pipe work from the CSLB asbestos certification but Cal/OSHA's asbestos standard still applies to every employee who touches it. And the water from a jetter, a heater flush, or a saw cut may not go down the storm drain. This lesson gives each rule with its trigger, what compliance costs, and what enforcement costs.
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4.19Lesson 10 min
Job-site craft: sequencing with the other trades, protecting the home, and the punch list that ends the job
Half of a plumbing business's reputation is made after the pipe is right: whether the plumber showed up the morning the framer finished, whether the hardwood was covered, whether the customer's last impression was a clean garage and a walk-through or a missing escutcheon and a text three days later. This lesson is the craft that the code does not grade and the customer does: the sequence on a remodel and how a plumber fits into it, the protection of the home that is both courtesy and, in a pre-1978 house, law, the inspection sequence as a schedule, and the punch list that turns the final walk-through into the final payment and the review.
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4.20Case 9 min
Case: the water heater that failed inspection twice
A competent plumber replaces a 50-gallon gas water heater in a garage, does clean work, and fails the final inspection on four items that were all on the checklist in lesson 4.5. He fixes what he thinks the inspector said, calls for reinspection, and fails again on two of the same items, because he did not read the correction notice; he remembered it. The customer, who cannot get her final payment released to the financing partner until the permit is signed off, is now two weeks in. This case walks each item to its section, the second failure to the habit that caused it, and the version of the same job that passed the first time because the plumber ran the sequence from lesson 4.5 before calling the inspector.
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4.21Case 10 min
Case: the gas leak call. The protocol, and the walk-away
A homeowner smells gas near the water heater and calls a plumber instead of the utility. The plumber's first job is not diagnosis; it is the protocol that keeps everyone alive: out of the house, no switches, no phones inside, the utility from outside, the meter shut only if it is safe to reach, and no work until the utility has cleared the meter. Then the method: isolate at the meter and the appliances, the manometer, the soap test, the 10 psi test on the isolated section, the repair, the test again, and the relight by the utility. The case also shows the walk-away: the customer who wants the plumber to "just fix it now" with the house still gassed up, and the one sentence that ends that conversation.
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4.22Case 9 min
Case: the "customer doesn't want a permit" job
A homeowner replacing a water heater asks the plumber to skip the permit: it costs money, the inspector is a hassle, and the old toilets would have to be replaced at final under SB 407. The plumber agrees, does a clean job for cash, and hears nothing for three years. Then the house sells, the buyer's inspector reads the heater's date code against the permit history, the seller's disclosure statement names the plumber, and the buyer's complaint to CSLB lands on a license that had never had one. This case follows the conversation, the three-year quiet, the complaint, the citation under section 7110, and the version of the same conversation where the plumber kept the customer and the license.
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4.23Template 5 min
Template: the job-site checklist, from the truck to the walk-through
One page per job, in the order the day runs: before leaving the yard, at the door, at the work area, during the work, at the end of the day, and at the walk-through. Every line traces to a lesson in this track; most of them are the difference between a job the customer recommends and one they remember for the wrong reason.
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4.24Template 6 min
Template: the pre-inspection checklist by stage. Underground, rough, water heater final, gas, and trim
The inspector's checklist, run by you the day before, with the section next to each line. Five blocks: underground before backfill, rough before the walls close, the water heater final, the gas test, and trim. Fifteen minutes with this sheet is the difference between the case in lesson 4.20 and a first-time pass.
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4.25Template 8 min
Template: the Injury and Illness Prevention Program starter for a plumbing shop of one to five
A fill-in-the-blanks Injury and Illness Prevention Program that meets the eight elements of 8 CCR 3203 for a plumbing shop with one to five employees: who is responsible, how compliance is enforced, how employees report hazards, how and when the truck and the job sites are inspected, how an injury is investigated, how a hazard is corrected, what training happens when, and what records are kept, with a plumbing-specific hazard list and the shop's procedures for gas leaks, trenches, confined spaces, heat, silica, ladders, and drain machines. Have the carrier's loss-control representative review it once; then follow it.
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4.26Template 6 min
Template: the Heat Illness Prevention Plan for a plumbing shop, outdoor and indoor
The written plan both heat standards require, in one document sized to a plumbing crew: water, shade and cool-down areas, the temperature triggers (80 °F outdoors for shade, 95 °F for high-heat procedures, 82 °F indoors), acclimatization for the new hire and the first heat wave, the emergency steps, and the training log. Print it, fill it in, translate it if your crew's language is not English, and keep it on the truck.
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4.27Template 5 min
Template: the customer options sheet (good / better / best) with the cost band, the permit path, and the code trail on each rung
One sheet the customer keeps: what you found, and three honest options with a price, what each includes and excludes, what each does not fix, whether it needs a permit and an inspection, the code section behind it, and the contract form it goes on. The customer initials the rung they choose, and the choice goes onto the contract. A filled example for a leaking 50-gallon heater in a house at 96 psi follows.
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Part 5 · 9 items

Customers, Warranties, and Complaints

Presenting price without apologizing, the cheaper competitor, bad news, the four- and ten-year liability windows, a warranty that protects you, the CSLB complaint process from your side, and reviews.

5.1Lesson 9 min
Presenting options and price without apologizing
A price built with the worksheet and presented from the options sheet needs no apology, and a plumber who apologizes for it teaches the customer to negotiate. This lesson is the presentation: lead with the finding, give the ladder with the honest sentence on each rung, say the number plainly and stop talking, answer "why so much" with the components rather than a discount, and keep every statement inside section 7161. It closes with the three sentences that end most price conversations and the one that ends the wrong ones.
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5.2Lesson 8 min
The other guy is cheaper: what to say, what to let the customer check, and the line not to cross
Every plumber hears it, and the honest answer is not a discount and not an insult. It is a short list of what a price includes that a cheaper one may not, said in a way that lets the customer check: the license number on CSLB's site, the bond and workers' compensation on file, the permit, the written contract with its notices, the insurance certificate, the warranty. This lesson gives the conversation, the three questions a customer can ask any bidder, what the law does to a customer who hires the unlicensed cheaper guy, and the line a licensed contractor must not cross when talking about a competitor.
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5.3Lesson 8 min
Delivering bad news: it is worse than you thought, and how to say so
The wall is open, the drain is on the camera, or the slab is warm, and what you found is bigger than the job the customer approved. The next five minutes decide whether the customer trusts you or calls a second plumber. This lesson is the delivery: stop the work, show the evidence, say the cause and the consequence plainly, give the ladder including the option of stopping here, write the change order before anything else happens, and never let the surprise arrive on the final invoice. It is the human side of lesson 3.5, and the case in lesson 3.12 is what happens without it.
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5.4Lesson 10 min
You are liable for four years (patent) and ten years (latent), and CSLB accepts complaints that long
A plumber's exposure on a job does not end at the final payment. A customer can file a CSLB complaint for four years after the work for anything they could have seen, and for ten years for a latent structural defect; a lawsuit for construction deficiencies runs on the same two clocks from substantial completion; and on a new home the Right to Repair Act adds its own standards and procedure. This lesson explains the windows, what "patent" and "latent" mean for plumbing, what the board can find against you inside them (section 7109's workmanship standard), and the three habits that make a ten-year exposure survivable: the paper, the photos, and the warranty terms that say what you promised.
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5.5Lesson 9 min
A warranty policy that protects you: what to promise, for how long, what to exclude, and what a warranty cannot do
A warranty is a promise you make in writing so that the year-two phone call is answered by the paper instead of by an argument. Written well, it says what is covered (your workmanship, for a stated period), what is not (the customer's own fixture, the drain you cleared but did not replace, damage from pressure you told them to fix), how to make a claim, and that the manufacturer's warranty on the equipment is the manufacturer's. Written badly, "lifetime warranty on all work" is a section 7161 claim you cannot keep. This lesson is the policy and its limits: what a warranty can promise, what it cannot waive, and why the honest version sells more than the inflated one.
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5.6Lesson 12 min
The CSLB complaint process from the contractor's side: responding, arbitration, and avoiding the citation
A complaint letter from CSLB is not the end of a license; the response to it usually decides the outcome. This lesson is the process from the contractor's side: what happens at intake, what the consumer services representative is trying to do and why cooperating is the cheapest resolution, what an enforcement investigation looks for and what to send, how the arbitration program works and why a good-standing contractor should usually take it, what a citation is and how to appeal it in 15 working days, and the two outcomes that are automatic: the suspension for not paying an arbitration award and the revocation that follows 90 days later. Most of it is the job folder from Phase 3 and the tone from this phase.
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5.7Lesson 9 min
Reviews: earning them, answering bad ones, and what you can and cannot do about a false one
Lesson 2.5 built the review system. This lesson is the part that comes after the first bad one: the two-sentence reply that wins the readers who were not there, the reply that loses them, the customer's legal right to say it (Civil Code 1670.8), the plumber's legal limit in answering (section 7161 applies to the reply), and the narrow path for a review that is actually false, where a lawyer's letter and California's anti-SLAPP statute make the threat to sue a bad idea for everyone but the customer. It closes with the review that most predicts a CSLB complaint, and what to do the day it appears.
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5.8Template 4 min
Template: the warranty statement
A one-page workmanship warranty to attach to every contract and list under "List of Documents to be Incorporated into the Contract": what is covered and for how long, the manufacturer's warranty passed through, the exclusions in plain words, how to make a claim, and the sentence about the customer's other legal rights. Fill in the periods and the contact, and use it on every job.
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5.9Template 5 min
Template: the CSLB complaint response letter
The written response to a CSLB complaint, in the order the consumer services representative reads it: the job in facts, each allegation answered with a document, what has been done or is offered, and a labeled list of attachments. Calm, complete, on time. A filled example for a workmanship-and-permit complaint on a water heater follows.
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Part 6 · 12 items

Growing the Business

Hiring under the ABC test, wage and hour, apprentices, adding classifications, systems, the numbers that predict failure, fleet and inventory, being an RMO for others, and selling or stepping back.

6.1Lesson 11 min
Hiring under AB 5: the ABC test, why a 1099 helper is a lawsuit unless they hold their own license, and the construction subcontract exemption
For a plumbing contractor, the question "employee or independent contractor" has a shorter answer than for most businesses, because two statutes stack: the ABC test in Labor Code 2775 presumes everyone who works for you is an employee unless they run a genuinely separate business doing something other than your business, and Labor Code 2750.5 says nobody doing plumbing work can be an independent contractor without their own contractor's license. The only lawful "1099" on a plumbing job is another licensed contractor under a written subcontract that meets Labor Code 2781's list. This lesson is the two tests, the exemption's conditions, the penalties for getting it wrong (which are per violation and per worker), and the hiring decision that follows.
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6.2Lesson 12 min
Employees: wage and hour, overtime, meal and rest periods, final-pay rules, and the workers' compensation class code
The first employee brings a body of law that a plumbing contractor runs into every single day: the minimum wage where the work is done, daily overtime after eight hours, the meal period before the end of the fifth hour, the ten-minute rest every four hours, the premium hour owed for each missed break, the final check due the day someone is fired, and the wage statement that has to show all of it. This lesson is the working rules with the section for each, the timekeeping that proves compliance, the final-pay clock that catches almost every new employer, and the workers' compensation class code that decides what a plumbing payroll costs to insure.
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6.3Lesson 9 min
Apprentices and the Division of Apprenticeship Standards: how a small shop trains its next plumber lawfully
The plumber a small shop needs in three years is the helper it trains today, and California has a formal way to do that: a registered apprenticeship through the Division of Apprenticeship Standards, where the apprentice is your employee on payroll at a rising percentage of the journeyman wage, attends related instruction through a program sponsor, and logs the hours that become their own license application. This lesson is how the system works, the two kinds of sponsors, what it costs and pays back, why it is the only way to put a trainee on a public works job, and the mistake of calling an untrained helper an "apprentice" without a registered agreement.
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6.4Lesson 9 min
Adding classifications: when to add the B, the C-20, or a second specialty, and how the exam waiver works
A C-36 can do plumbing and the work that is incidental and supplemental to it, and nothing else. The day a customer asks the plumber to replace the furnace with the water heater, or a remodeler asks for the whole bathroom, the answer is a second classification or a subcontract. This lesson is the map: what the C-36 covers and where "incidental" ends, what the C-20 adds and what a B or B-2 adds, the exam that a new classification normally requires, and the section 7065.3 waiver that lets an experienced qualifier add a closely related classification without one. It ends with the business question: which classification the market you are already in is asking for.
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6.5Lesson 9 min
Systems: field-service software, the price book, and dispatch. What to buy, when, and what it must produce
A one-truck shop runs on a phone, a pad of contracts, and the Friday reconciliation. A three-truck shop that runs that way loses a job a week to a missed callback and a form left in the wrong truck. This lesson is the systems decision: what field-service software actually has to do for a California plumbing contractor (produce the compliant contract with the notices, gate the deposit, carry the price book, capture the signature and the photos, issue the release with the payment, and hand the bookkeeper clean data), what the price book looks like when it lives in the software, how dispatch works when there are two trucks, and the order to buy in. It is a requirements list, not a product review.
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6.6Lesson 10 min
KPIs: average ticket, close rate, gross margin, and the three numbers that predict failure
A plumbing business fails with a full calendar more often than with an empty one, because the owner watched revenue and never watched the four numbers that revenue hides. This lesson defines the ones worth computing every month from the books you already keep: average ticket, close rate, gross margin (and why it is a margin, not a markup, again), and billable-hour utilization; then the three that predict failure early enough to fix: cash days on hand, receivables over 30 days, and the tax and renewal set-asides actually in the bank. A worked month for a two-truck shop shows how a "good month" reads when the numbers are computed.
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6.7Lesson 10 min
Supply-house credit at scale, the fleet, and inventory: the second truck's paperwork and the parts on it
The second truck triples the paperwork of the first. This lesson is the three systems that grow with the fleet: supply-house credit when three people are buying on the account and the limit has to carry a $30,000 month; the fleet itself, including the rule most plumbers discover from a CHP officer, that a service truck with a gross vehicle weight rating over 10,000 pounds makes the shop a motor carrier that needs a Motor Carrier Permit, a carrier number, and a terminal inspection; and truck inventory, the parts that make a call a one-visit job and the count that keeps them from walking away.
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6.8Lesson 9 min
Becoming an RMO for someone else's company: the liability you are taking on, and the only version that is lawful
Lesson 0.4 covered the offer in its crude form: a friend pays you to "put your license on" a company. By year three the offer is dressed better: a real company with real jobs, a minority ownership stake, a title, and a monthly fee, from someone who lost their qualifier or never had one. This lesson is what saying yes means in law: you are personally responsible for that company's construction operations under section 7068.1, with a misdemeanor and license discipline if you do not actually supervise; the exceptions that allow a second license at all; the bond you will owe; the disassociation rule that keeps you responsible until CSLB receives your letter; and the narrow version of the arrangement that is lawful, which involves real ownership, real supervision, and a written agreement about both.
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6.9Lesson 10 min
Selling or stepping back: what a plumbing business is worth, what a buyer is actually buying, and what the license will and will not let you transfer
A plumbing business that can be sold is one that runs without its owner, and the license is the reason most cannot: it is not transferable, the number follows you only into a company you control, and the buyer of a sole owner's business is buying customers, trucks, and a phone number, not a license. This lesson is the end of the road planned from the start: what a buyer values (recurring customers, systems, staff, a clean record) and what a buyer cannot buy (your license, your qualifier history), the two ways a sale is structured around the license rules, the qualifier transition that keeps the buyer licensed, and the exposure that stays with you after the check clears. It also covers the quieter option: stepping back as the qualifier of a company someone else runs, with the 7068.1 duties intact.
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6.10Template 5 min
Template: the hiring checklist (AB 5-safe), from the decision to the first day
One page from "we need another person" to the end of the first day, with the decision that AB 5 forces at the top: employee, or licensed subcontractor under a written subcontract that meets every Labor Code 2781 condition. The employee path lists what must exist before the first day and what happens on it, in order, with the section behind each line. Fill it in for every hire and keep it in the personnel file.
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6.11Template 4 min
Template: the new-hire packet index
A one-page index of what goes into the packet every new employee receives and signs on the first day, in the order to hand it over, with the source of each form, so the packet is printed the night before and the personnel file is complete by the end of the day. It is the companion to the hiring checklist.
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6.12Template 4 min
Template: the monthly KPI sheet
One page, once a month, from the books: the four operating numbers by technician, the three failure signals with their thresholds, and the actions taken. The example is the two-truck month from lesson 6.6 filled in.
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Part 7 · 6 items

Staying Licensed

Renewal, the bond and workers' compensation lapses that suspend a license automatically, the 90-day change rule, tracking code cycles, and what to keep for how long.

7.1Lesson 8 min
Renewal every two years: the clock, the fee, the five-year window, and what an expired license means mid-job
A contractor's license lasts two years and then it does not, and the day after expiration the plumber is unlicensed in every way that matters: contracts unenforceable, collection barred, permits refused, and a misdemeanor for each job. This lesson is the clock (two years from the end of the issuance month), the process (the board's form, the fee, and the bond and workers' compensation that must be current), the five-year window to renew late with a delinquency fee, what happens to jobs in progress on the day the license expires, and the calendar entry that prevents all of it.
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7.2Lesson 9 min
A bond or workers' compensation lapse suspends the license automatically. The most common suspension, and the calendar that prevents it
Neither the bond nor the workers' compensation certificate expires on the license's schedule, and each of them suspends the license by itself when it lapses: the workers' compensation suspension is automatic by operation of law on the day coverage ends, and the bond suspension follows 30 days after CSLB receives the surety's cancellation. Both are public on the license record, both make every day of work unlicensed, and both are the most common reasons a working contractor's license is suspended. This lesson is how each lapse happens (an unpaid premium, an audit, a carrier's non-renewal, a bond claim), how to see it coming, how reinstatement works, and the calendar that keeps a working shop from ever finding out.
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7.3Lesson 7 min
Address changes within 90 days, and personnel changes: the notices that keep the license record true
CSLB's record of your business is the record: the address where every notice goes, the qualifier who is responsible for every job, the personnel who may sign for the company, the name that must match every contract. Section 7083 gives 90 days to report any change, makes a late change effective only when the board receives it, and makes lateness itself grounds for discipline. This lesson is the list of what must be reported, the forms, the two changes with their own clocks (a qualifier leaving, and a death or dissolution), and the things outside CSLB that a change drags with it: the trucks, the fictitious business name, the bond, the insurance certificates, and the city licenses.
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7.4Lesson 8 min
Code cycles: the 2025 California Plumbing Code took effect January 1, 2026; the intervening supplement lands July 1, 2027; the 2028 code on January 1, 2029. How to track them
The plumbing code a plumber is inspected against changes on a schedule: a new California Plumbing Code every three years, effective January 1 of the year after publication, with an intervening supplement halfway through, plus each city's local amendments filed on their own timeline. The 2025 California Plumbing Code took effect January 1, 2026; the intervening supplement takes effect July 1, 2027; the 2028 code takes effect January 1, 2029. This lesson is the cycle, which edition applies to a given job (the permit date), where the changes are published and how to read only the parts that touch a C-36, and the two habits that keep the price book and the pre-inspection checklist current: the January and July check, and the city amendment list.
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7.5Lesson 8 min
Record retention: what to keep, for how long, and where the clocks come from
Every rule in this track leaves a record, and each record has a clock set by a different agency: ten years for the job folder because of the CSLB complaint window, three for payroll because of the Labor Code, four for employment taxes because of the IRS, three after termination for the I-9. This lesson is the retention schedule for a plumbing contractor in one place, organized by the folder the record lives in, with the section each clock comes from, and the one rule that simplifies most of it: keep the job folder ten years, the money records seven, the people records three after they leave, and destroy nothing while a complaint, a claim, or an audit is open.
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7.6Template 5 min
Template: the annual compliance calendar
One page that holds every date a plumbing contractor's license, insurance, taxes, registrations, and code depend on: the fixed ones the law sets and the blanks for the ones your policies set. Fill it in once, copy the entries into every calendar the business uses with 90/60/30-day reminders, fund the renewal account monthly, and review the sheet on January 1 and July 1.
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How the public pages work

Every lesson has a public page with its summary and key points, so you can see exactly what it covers before you buy. The method, the worked cases, the checklists and the templates are inside the course.

Why every lesson has a date

California changes these rules often: the home improvement contract statute was amended again for 2026, and workers' compensation becomes mandatory for every licensee on January 1, 2028. Each lesson carries the date its law was checked, and we update it when the law moves.

Pass the exam, then keep the license

One payment covers the C-36 exam course and everything on this page.

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